Extraction-turbine.



W. KIESBR. EXTRACTION TURBINE.

APPLICATION FILED DBO. 2a, 1913.

Patented May 19, 1914 yitnesses:

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COLUMBIA PLANOORAPH C0..WA$HINC\TON. n. c.

UNITED I STATES PATENT orrron.

WALTER KIESER, OFCHARLOTTENBURG, GERMANY, ASSIGNOE TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

EXTRACTION -TURBINE.

Specification of Letters Patent.

Patented May 19, 1914;.

Application filed December 23, 1913. Serial No. 808,373.

a specification.

This invention relates to steam turbines and especially to those in which provision is made for utilizing the low pressure or exhaust steam for heating, cooking or other in dustrial purposes. It sometimes happens that the amount of steam required for this purpose is practically constant, so that when the turbine is carrying a varying load the exhaust steam will not be adequate at all times to meet the industrial demand.

My invention is designed to meet this emergency, and it comprises providing such a turbine with an auxiliary valve by which high pressure steam can be admitted directly to the exhaust pipe, in order to make up any deficiency in the amount passing through the bucket wheels.

The auxiliary valve is operated automatieally in connection with the usual nozzle valves, and in such a manner that when the steam passing through said nozzle valves is Sll'fllClQIli) in quantity to supply the industrial demand, then the auxiliary valve will be closed so that all the steam consumed may perform useful work in the turbine. But when the load drops oft and some of the nozzle valves have to be closed then the auxiliary valve is automatically opened to a degree suflicient to permit enough additional high pressure steam to pass through to make up the constant amount required by the industrial system. The total weight of steam used is always the same, but the work it does in the turbine varies with the load. The auxiliary steam can be admitted directly into the exhaust pipe, or into the bucket wheel chamber, as may be most convenient, since the extra quantity of steam admitted to the wheel chamber has no eiiect upon the wheel and performs no work.

The invention is particularly well adapted for extraction turbines having only one wheel and the accompanying drawing is a diagrammatic section of such a machine embodying my invention.

The casing 1 contains a bucket wheel 2, which for the sake of simplicity is shown as having two rows of buckets 3 cotiperating open and close.

with a row of stationary intermediates 4..

High pressure steam is supplied to said buckets through groups of nozzles 5, 6, 7 and the like, each group opening from its own chamber 8 to which the steam is admitted by a valve 9. The several nozzle valves are controlled auton'latically by a speed governor 10, acting upon a lever 11.,

and serving to open said valves in succession as the speed drops under an increase of load, and to close them in reverse order when the load drops. I have illustrated a conventional way of effecting this result, comprising a slide 12 pivotally connected to the lever 11 and containing a longitudinal slot whose cam sections 13 act successively upon the stems of the valves 9 as the slide is moved up or down. Inthe drawing, all the valves are closed, but a downward movement of the slide will open them one after the other beginning with the lowest, and each valve will be held open while those above it are being opened. hen the slide is lifted, the valves will close one after another, beginning with the uppermost one. It is, of course, immaterial in which order the valves provided their operation is successive.

The valves admit high pressure steam to the chambers 8 from a steam chest 14 to which the steam is conveyed by a main 15. A port 16 opens from said steam chest to the bucket wheel chamber 17, and said port is controlled by the auxiliary valve 18. The stem of this valve is automatically operated by the same mechanism that controls the valves 9, but in an inverse manner, so that it opens more and more as they successively close, and vice versa. A conventional mode of effecting this is shown in the drawing, where the slide 12 is provided with a cam slot 19 which moves the valve 18 in the opposite direction to that in which the valves 9 are moved by the earns 13 in the other slot. The quantity of steam flowing through this auxiliary valve is just sufficient to supplement that flowing through the nozzle valves and maintain at all times a constant quantity passing to the exhaust pipe '20 and thence to the industrial consumption circuit.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but

trial consumption system, admitting steam to the buckets, an auxiliary valve admitting steam to mingle With the ex- I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to'secure by Letters Patent of the United States, is,-

1. The combination With an elastic fluidsteam to mingle With the exhaust Without acting upon the rotor, and governor controlled means actmg on both said valve means for opening and closing the. same in inverse order.

2.- The combination with a steam turbine having its exhaust connected to an industrial consumption system, of nozzle valves admittingsteam to the buckets, and an auxiliary valve admitting steam to mingle with the exhaust Without acting upon the buckets.

3. The combination with a steam turbine having its exhaust connected to an indusof nozzle. valves haust Without acting upon the buckets, and

trial consumption system,

means for opening and closing said valve in inverse proportion to the nozzle valves.

4. The combination With a steam turbine having its exhaust connected to an indusof nozzle valves admitting steam to the buckets, an auxiliary valve admitting steam to mingle With the exhaust Without acting upon the buckets, and means controlled by the speed governor for automatically opening and closing said auxiliary valve in inverse proportion to thenozzle valves.

5. The combination with a steam turbine having its exhaust connected to an industrial consumption-system demanding a constant quantity of steam, of nozzle valves admittlng steam to the buckets, an auxiliary valve admitting steam directly to'the Wheel chamber, andimechanism controlled by the speed governor for regulating all of said valves so as to admit a constant quantity of steam to the turbine casing.

In Witness whereof, I have hereunto set my hand this th day of December, 1913.

. WALTER KIESER.

Witnesses:

OSCAR EBERTH, GUsT HULB-RooK.

odpiearofthis patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, .D. 0. 

